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Retrieve user data or vendor data.
Scaleway user/vendor data API returns HTTP/404 if user/vendor data is not
set.
This function calls `url_helper.readurl` but instead of considering
HTTP/404 as an error that requires a retry, it considers it as empty
user/vendor data.
Also, be aware the user data/vendor API requires the source port to be
below 1024 to ensure the client is root (since non-root users can't bind
ports below 1024). If requests raises ConnectionError (EADDRINUSE), the
caller should retry to call this function on an other port.
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Handle the retrying logic in case the source port is used.
Scaleway metadata service requires the source port of the client to
be a privileged port (<1024). This is done to ensure that only a
privileged user on the system can access the metadata service.
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Define metadata_url based upon api-metadata URL availability.
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There are three ways to detect if you are on Scaleway:
* check DMI data: not yet implemented by Scaleway, but the check is
made to be future-proof.
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* "scaleway" is in the kernel cmdline.
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Configure networking according to data received from the
metadata API.
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